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Idaho Department of Environmental Quality

Post Falls wastewater facility upgrades will save city money, minimize chemical use

May 29, 2018

By DEQ Grants and Loans Program

Upgrades to the City of Post Falls Water Reclamation Plant will save the city almost 1,300,000kW-hr and $80,000 a year. The energy savings is equal to the total annual power needs of over 100 homes or the annual lighting needs of 1000 residences.

The upgrades were made possible with a low-interest loan from the Idaho Department of Environmental Quality State Revolving Fund (SRF). The SRF loan process emphasizes reductions to operations and maintenance costs, and an investigation required by the SRF’s Green Project Reserve Program, revealed opportunities for the facility upgrade that would provide significant savings for the city.

Instead of more energy-intensive alternatives, the city chose to fund and install energy-efficient green options, which will provide substantial cost savings from reduced energy bills and rapidly offset the initial cost difference of the green components.

A primary recommendation by the city’s consultants was to install equalization tanks to reduce the variability of flow and loads entering the reclamation plant. Tank mixers and pumps equipped with variable frequency drives as well as an advanced computer-based monitoring and control (SCADA) system, ensure equipment operates at optimum speeds, minimizing power costs. Special piping design and mechanical arrangements further reduce energy requirements by enhancing the city’s flexibility in managing operations.

Additional cost-effective green improvements identified also include energy-efficient LED lighting and the strategic locating of chemical feed piping to reduce chemical usage by approximately 50%.

By providing these energy-efficient and innovative upgrades, City of Post Falls can expect many more years of continued cost savings.

For more information on the Green Project Reserve Program, visit www.deq.idaho.gov/water-quality/grants-loans/green-project-reserve

Innovative wastewater facility upgrades will save Nampa $7 million, minimize sludge disposal

September 20, 2017

By DEQ Grants and Loans Program

Upgrades to the city of Nampa wastewater treatment plant include a biological system for phosphorus removal, saving an equivalent of $7 million over a 20-year period as compared to any other alternative evaluated. The process so efficiently reduces the need for chemical addition and so effectively minimizes the amount of chemical sludge to be disposed, that these reductions alone result in a simple payback period of 2.5 years for the upgrades. In addition, new energy efficient pumps result in energy savings equal to the annual lighting needs of 550 residences.

The project was made possible with a low-interest loan from the Idaho Department of Environmental Quality State Revolving Fund (SRF). The SRF loan process emphasizes reductions to operations and maintenance costs.

Investigation required by the SRF Green Project Reserve Program revealed cost-effective 'green' opportunities to upgrade the system. Substantial cost savings will rapidly offset the initial cost difference of the 'green' components.

The biological process that has been implemented significantly reduces the need for chemical addition for phosphorus removal and greatly decreases the amount of chemical sludge to be disposed.

City consultants also recommended installing new premium energy efficient turbine pumps equipped with Variable Frequency Drives, resulting in annual savings to the city of $33,160 and 663,200kW-hr.

To learn more about grants and loans available to wastewater and drinking water systems, visit our Grants and Loans webpage.

 

 

SRF-funded wastewater facility upgrades will save Coeur d'Alene 858,100kW-hr of energy a year

September 20, 2017

By DEQ Grants and Loans Program

Upgrades to the city of Coeur d’Alene wastewater treatment plant will save the city almost 858,100kW-hr and $55,860 per year. The energy savings is equal to the total annual power needs of 70 homes or the annual lighting needs of 700 residences.

The upgrades were made possible with a low-interest loan from the Idaho Department of Environmental Quality State Revolving Fund (SRF). The SRF loan process emphasizes reductions to operations and maintenance costs.

The savings come from the installation of energy-efficient 'green' options the city chose to fund when upgrading their wastewater treatment facility, in lieu of the more energy-intensive alternatives available. Substantial cost savings from reduced energy bills will rapidly offset the initial cost difference of the 'green' components. Coeur d’Alene can expect over $2.2 million in cost savings over the 40-year life of the facility due to the energy-efficient treatment of city wastewater.

Investigation required by the SRF Green Project Reserve Program revealed opportunities to upgrade the system that would provide additional energy and money savings. City consultants recommended installing a combination of fine bubble aerators, high speed turbo blowers, and dissolved oxygen control, to reduce aeration power demand by approximately 71 percent.

In addition, all new pumps and blowers were equipped with Variable Frequency Drives and premium energy-efficient motors to conserve energy and enhance the operability of the treatment process.

To learn more about grants and loans available to wastewater and drinking water systems, visit our Grants and Loans webpage.

DEQ-funded drinking water system upgrades will save Ashton over $35,000 a year

September 20, 2017

By DEQ Grants and Loans Program

ASHTON - Upgrades to the City of Ashton drinking water system will save the city almost 174,000kWh of energy and 21,700,000 gallons of water every year, also resulting in annual cost savings of over $35,000. The upgrades were made possible with a low-interest loan from the Idaho Department of Environmental Quality State Revolving Fund (SRF). The SRF loan process emphasizes reductions to operations and maintenance costs.

The savings comes from the installation of energy-efficient 'green' options the city chose to fund when upgrading their drinking water system. Substantial cost savings from reduced energy bills will rapidly offset the initial cost difference of the 'green' components. Ashton can expect many subsequent years of continued cost savings due to the installation of energy-efficient and water conserving drinking water technologies.

Investigation required by the SRF’s Green Project Reserve Program revealed opportunities to upgrade Ashton’s drinking water system that would provide water and energy conservation. The city’s consultants recommended replacing malfunctioning water meters with an automatic meter reading system to conserve water and save on treatment and pumping costs, installing a variable frequency drive on an existing pump to ensure operation at optimum speeds thereby minimizing energy, and replacing 12,600 feet of leaking distribution pipe saving over 17,000,000 gallons of treated water each year.

To learn more about grants and loans available to wastewater and drinking water systems, visit our Grants and Loans webpage.
 

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